In V4, everything except the power supply was unified onto one board. V3 had a substantially different internal structure from the subsequent revisions, featuring several interconnected printed circuit boards. SCPH-10000 and SCPH-15000 did not have built-in DVD movie playback and instead relied on encrypted playback software that was copied to a memory card from an included CD-ROM (normally, the PS2 will only execute encrypted software from its memory card see PS2 Independence Exploit). These models instead included a PCMCIA slot. Three of the original PS2 launch models (SCPH-10000, SCPH-15000, and SCPH-18000) were only sold in Japan and lacked the expansion bay of later PS2 models.
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